Abstract: The railway distribution room is the power center to maintain the power consumption of various facilities in the station. The fire warning device plays a vital role in the safe and stable operation of the distribution room. Therefore, this paper in view of the problems existing in the current railway power distribution room fire early warning, put forward the active detection of very early fire warning way, detailed analyzes the design of the early warning system and application advantages, combined with the actual thermal hazard detection case, it is concluded that the fire warning system can alert the potential fire hazard in the room, to prevent fire to win more processing time.